Mixer for road materials



Aug. 7, 1934. A. w. BOLLARD MIXER FOR ROAD MATERIALS Filed July 30. 1932'IIIIIIIIII/ ATTORNEY-5 Patented Aug. 7, 1934 umrso STA-TEST I 1,969,5457 MIXERQFoR ROAD MATERIALS Arthur W. Bollard, Cleveland Heights, Ohio,assigner to The F. D. Glimmer & Son Compan Cleveland, Ohio, acorporation of Ohio Application July 30, 1932, Serial No. 626,488

6 Claims.

This invention relates to mixing machines such as are used for mixingcrushed rock of various sizes with asphalt or other binding materials.The

invention has to do more particularly with the linings of such mixers,its object being to provide a lining comprising sheets which are soformed and so related to each other as to be more or less interlockingat their edges, whereby the members of the lining secure or hold eachother in place, the final securement being accomplished with a minimumnumber of bolts, rivets, or like securing devices, with the final resultof so simplifying the securement that original assembly of the mixer isexpedited and simplified and replacement of any of the lining membersbecomes a relatively simple task.

Further objects of the invention are in part obvious and in part willappear more in detail hereinafter.

In the drawing, which represents one embodiment of the invention, Fig. 1is a plan View, portions of the heaters being omitted for simplicity ofillustration; Fig, 2 is a cross section on the line 2-2, Fig. 1, lookingin the direction of the arrows; Fig. 3 is a plan view, on a largerscale, showing several of the members of the lining laid in properrelative arrangement but with their edges separated; and Fig. 4 is adetail section, on

. a larger scale, on the line 4-4, Fig. 1.

As to most of its features, the mixer forming the subject matter of thepresent invention is of the same general form and construction as themixer illustrated in a prior Patent No. 1,741,013, for Mixer for roadmaterials, granted December 24, 1929 to Frederick H. Cummer, to whichreference may be had for a more complete description if desirable ornecessary. Briefly described, the mixer comprises a suitable frame 1provided with a shell or casing 2 made of sheet metal of properthickness and strength, the shell being reinforced around its edges inany suitable manner, such as by the angle irons 3. Said shell is' soformed as to provide a cavity for containing the materials to be mixed,said cavity being defined by the opposite, parallel straight end wallsa, side walls 5, and a bottom 6, the latter being curved in twocylindrical parts around the axes of the beater shafts to be laterreferred to, in a manner to provide a saddle shaped crest or ridge 6provided with a central rectangular opening 7 closed by a suitablemovable gate or valve member 8. Across the cavity, between the two endwalls 4 thereof, extend two parallel shafts 9 provided with heaters 10,the rotation of said shafts and heaters being adapted to stir up and mixthe materials within thecavity.

' The frame and shell parts so far described. are

'made of ordinary steel or-iron. However, it is desirable to increasethe resistance to wear of 6 the inner surfaces of the shell where thelatter is curved and lies fairly close tothe ends of the heaters, andwhere the wear is concentrated. It is customary, therefore, in mixers'of this kind to' provide the mixer, within its'shell, with a liningformed of some material having a high resistance 7 to wear byabrasionsuch, for example, as manganese steel or the like.'Ihis'material is not only expensive, but it is very diflicult to work,particularly by a cutting operation, and it is usually necessary to castit in as nearly finished form as possible, the most that can be done toit being to grind off rough spots to a limited degree. I thereforeprovide my mixer with alining of manganese steel or other abrasionresisting sheets cast to proper iorm and secured within the shell andclosely fitting the inner surfaces of the shell sheets. Thislining Iform, in the arrangement shown, in eightseparate parts, to wit, four endmembers 11 which are alike in all respects except that two areright-handed and two left-handed, two intermediate side members 12 ofidentical form, and two intermediate center members -13, which likewiseare of identical form. While the mixer is rectangular in plan view, forconven ience in description that dimension of the mixer in the directionof the lengths of the beater shafts will be referred to as longitudinaland the dimen* sion at right angles thereto as transverse.

The center members 13, generally speaking, are of U-shape in plan viewin that they each include a longitudinally extending bodyportion 14 andtwo transversely extending arms 15. In end view, as shown in Fig. 2,they are curved to cylindrical form. The two members 1S togethersurround or embrace the edges of the discharge'opening '7, These centermembers are not directly'fastened tothe shell in any manner, such as bybolts, rivets or the like, but they are secured and confined in placewholly by the-grip or'hold or' confining action" of the edges of theadjacent members'of the lining. This result is accomplished by an over--hang of the edges of the surrounding members upon the edges of themembers 13. As shownin Fig. 3, the outer edges of members 13 arebevelled 105 off at 16, the bevel in all directions being outwardly anddownwardly. The longitudinal body portions 14 are'held in place orconfined by correspondingly but reversely inclined or undercutlongitudinal edges of the side members 12, as 1-10 both'their outer andinner longitudinal edges;

shown at 17, and the members 12 are held in place by removable bolts 18passing through slots in their upper edges and through the adjacentshell wall, as well as by the overhang of the adjaoff square at 20, asis usual, while their trans-' Verse edges which lie adjacent to members12- and 13 are undercut on a bevel, as at 21,'so that the end edges ofthe members 11 overlap the adjacent edges of the members 12 and 13.

Members 11 are secured in place by removable bolts 22 passing throughslots in their upper edges and through the wall of the shell, as withthe bolts 18, and at their inner longitudinal edges, adjacent the crest6, they are fastened to the shell in any suitable manner, such as byrivets 23 or other equivalent securing devices.

With this arrangement it will be observed that members 11 are directlysecured to the shell at They serve to secure and hold in place thetransverse edges of both members 12 and13. Meme bers 12 in turnhavetheir outer upper edges secured directly to the shell and theirinner longitudinal edges serveto confine the corresponding edges ofmembers 13. As a result, the work of installing separate members of thelining, or of replacing the same, is materially reduced. Heretoforethe-several members of a lining have been secured, to the shell only bythe use of rivets, bolts or the like, spaced around all edges thereof,and not only did the original assembly require manipulation of all theserivets or bolts, but also, replacement of any worn member of the liningrequired shearing out the rivets from beneathfor the removal of the wornmember, and the insertion of new rivets for attachment of the replacingmember, Bolts have been used only along the upper edges of the liningmembers, those edges of the members beneath the beater shafts beingordinarily attached by rivets with countersunk heads.

In my improved arrangement replacement of one of the members 13, forexample, requires punching out but three rivets in one of the endmembers 11 and removal of the detachable bolts 22 and 18 in the saidmember 11 and the adjacent member 12. Removal of theemembers 11 and 12frees the member 13, which can be replaced, after which the parts 11 and12 can be restored to position and again secured. This arrangement verymaterially reduces not only the cost of replacement but also the timethe .mixer is out'of service.

What I claim is: 1. A .mixer of the character described, com,- prising abox-like body provided with a shell and having an opentop, oppositevertical end and sidewalls and a bottom formed in two parallel"part/cylindrical portions meeting in a longitudinally extending ridge,the bottom having a central discharge opening, and a lining for, saidbottom supported by the shell and formed of material resistant toabrasion and metal working operations, said lining including an innerborder portion surrounding the edges of said opening and free ofattachment to the shell, the outer edges of the border portion slopingdownwardly away from said opening, and outer lining mem- I substantiallyU-shape in plan View and each having two side arms, the ends of the sidearms of the two members meeting at the crest of said ridge.

3. A mixer of the character described in claim 1, the outer membersincluding four end members one in each of the four corners of the bodybottom. 7

4'. A mixer of the character described in claim 1, the outer membersincluding four end members one in, each of the four corners of the bodybottom, and two intermediate side members each laterally opposite thedischarge opening, each side member at its inner edge overlying theborder portion, and each end memberoverlying a part of the borderportion and an edge of an intermediate member.

5. A mixer of the character described in claim 1, the outer membersincluding four end mem bers one in each of the four corners of the bodybottom, said end members being arranged intwo pairs, the members of.each pair being laterally opposite to each other and theirinnerlongitudinal edges meeting at the crest of the ridge.

6. A mixer 'of the character described, comprising a box-like bodyprovided with a shell and having an open top, opposite vertical end andside walls anda bottom formed in two parallel part cylindrical portionsmeeting in a longitudinally extending ridge, the-bottom having a centraldischarge opening, and a lining for said bottom supported by said shelland formed of material resistant to abrasion and metal workingoperations, said lining including an inner border portion surroundingthe edges of said opening and free of attachment to said shell, theouter edges of the border portion slopingdownwardly away from theopening, and outer members attached to the shell and distributed aroundand having their inner edges overlying and forming a cavity to receivethe sloping edges of the border portion, said outer members includingfour end members, one in each of the four corners of the bottom, and twointermediate side members each opposite the discharge opening, theborder portion including a plurality of members which abut each otherend to end and are so formed and arranged that all of said members aremutually dependent and each is non-removably confined in said recess bythe presence of all other members. a

.. ARTHUR W. BOLLARD.

